Petroleum ChemistryPetroleum ChemistryНефтехимия0028-24213034-5626The Russian Academy of Sciences65564210.31857/S0028242123010112UOHSRGArticlesСтатьиResearch ArticleNeutralization of Acidic Exhaust Gas Components by Overbased Additives in Marine Oils: Effects of the Acid Composition on the Neutralization MechanismВлияние состава кислотных компонентов выхлопных газов на механизм их нейтрализации высокощелочными присадками в судовых маслахBakuninV. N.БакунинВ. Н.victor.bakunin@mail.ruVolkovV. V.ВолковВ. В.petrochem@ips.ac.ruBakuninaYu. N.БакунинаЮ. Нpetrochem@ips.ac.ruRussian National Research Institute for Oil Refinery (VNII NP)Всероссийский институт по переработке нефти (ВНИИ НП)A.V. Shubnikov Institute of Crystallography, Russian Academy of SciencesИнститут кристаллографии им. А.В. Шубникова РАН15022023631NO1 (2023)№1 (2023)13214211022025Copyright ©; 2023, Russian Academy of SciencesCopyright ©; 2023, Российская академия наук2023Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0028-2421/article/view/655642

Using a combination of IR spectroscopy and small-angle X-ray scattering methods, the study investigates the initial steps of the neutralization of commercial additives, such as overbased calcium alkylbenzene sulfonate and calcium alkyl salicylate, by a number of model acids. The model acids included sulfuric acid, nitric acid (both simulating acidic products of marine fuel combustion), and acetic acid. For the sulfonate additive, it was shown that the amorphous CaCO3 core crystallizes, predominantly into vaterite, with a simultaneous slight increase in the size of the additive’s solid core. In the case of the salicylate additive, no CaCO3 crystallization was observed, and the solid core was slightly reduced in size. The paper proposes an explanation for these transformations, which rests on the difference in the strength of the acids that constitute the shell of the additive’s nanoparticles, and in the water solubility of the calcium salts produced.

Методами ИК-спектроскопии и малоуглового рассеяния рентгеновских лучей изучены начальные стадии процесса нейтрализации коммерчески доступных присадок - высокощелочных алкилбензолсульфоната и алкилсалицилата кальция - модельными кислотными продуктами горения судовых топлив - серной и азотной и уксусной кислотами. Показано, что в случае сульфонатной присадки происходит кристаллизация аморфного ядра карбоната кальция с образованием преимущественно ватерита; одновременно происходит небольшой рост размеров твердого ядра присадки. В случае салицилатной присадки процесс кристаллизации СаСО3 не имеет место, наблюдается небольшое снижение размеров твердого ядра. Предложено объяснение наблюдаемых изменений на основе силы кислот, формирующих оболочку наночастиц присадки, а также на различии в растворимости образующихся солей кальция.

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